.div1 {
    width: 200px;
    height: 200px;
    background-color: aqua;

}
.div2 {
    width: 100px;
    height: 100px;
    background-color: red;

}
.div3 {
    width: 80px;
    height: 80px;
    background-color: blue ;

}

.div4{
    width: 50px;
    height: 50px;
    background-color: green;

}
